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[" 7.The equation of the circle which to...

[" 7.The equation of the circle which touches "x" axis and "],[" whose centre is "(1,2)," is "],[[" (a) "x^(1)+y^(2)-2x+4y+1=0],[" (b) "x^(2)+y^(2)-2x-4y+1=0],[" (c) "x^(2)+y^(2)+2x+4y+1=0],[" (d) "x^(2)+y^(2)+4x+2y+4=0]]

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